Random blackening of new growth - flower week 5

  • Thread starter Nate_in_AK
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Nate_in_AK

Nate_in_AK

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Species is called "Punch Breath", I've grown it many times. Hydro, EC 1.6 PH 6.2-6.5. Feeding GH Flora + CalMag. Overall the plant is doing well, roots are healthy, and all the mature growth looks great, but there are several sites where new growth looks deficient or something:
Random blackening of new growth   flower week 5

I've seen this from wind damage before, but these damage sites are not near the fans.

I'm going to go ahead and change my res out, but I'm curius if anyone has seen this before and figured out what it might be? I have follwed the same feeding schedule as previous grows. This is the first time seeing this behavior.
 
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